Fuel cell air flow calculation method, device, equipment and storage medium

Abstract

The present invention belongs to the field of flow calculation technology and discloses a fuel cell air flow calculation method, device, equipment and storage medium. The method includes: obtaining backpressure valve information and fuel cell stack information of the system to be evaluated; determining the exhaust mass flow rate based on the backpressure valve information of the system to be evaluated; determining the consumed oxygen mass flow rate based on the fuel cell stack information of the system to be evaluated; and determining the intake mass flow rate based on the exhaust flow rate and the consumed oxygen mass flow rate. Through the above method, the exhaust mass flow rate and the consumed oxygen mass flow rate are directly calculated based on the ambient air information and backpressure valve information of the system to be evaluated, thereby calculating the intake mass flow rate, realizing the acquisition of the intake mass flow rate without configuring an air mass flow meter, and reducing the calculation cost of the intake mass flow rate.

Description

Technical Field

[0001] The present invention relates to the field of flow calculation technology, and in particular to a fuel cell air flow calculation method, device, equipment and storage medium. Background Art

[0002] Controlling air flow in hydrogen fuel cell systems is crucial for improving system performance. Air flow is measured using a mass air flow meter installed in the intake line. The program adjusts the compressor speed based on the deviation between the measured and target flow rates to achieve air flow control. However, currently implemented technologies all use mass air flow meters to measure air flow, which is relatively costly.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a fuel cell air flow calculation method, device, equipment and storage medium, aiming to solve the technical problem that the existing technology uses air mass flow meters to measure air flow, which is costly.

[0005] To achieve the above object, the present invention provides a method for calculating the air flow of a fuel cell, the method comprising the following steps:

[0006] Obtain the back pressure valve information and stack information of the system to be evaluated;

[0007] determining the exhaust mass flow rate according to the back pressure valve information of the system to be evaluated;

[0008] Determining the consumed oxygen mass flow rate based on the stack information of the system to be evaluated;

[0009] An intake air mass flow rate is determined based on the exhaust gas flow rate and the oxygen mass flow rate.

[0010] Optionally, determining the exhaust mass flow rate according to the back pressure valve information of the system to be evaluated includes:

[0011] Determine standard parameter information under standard conditions;

[0012] Determine back pressure valve inlet information and back pressure valve outlet information according to the back pressure valve information of the system to be evaluated;

[0013] The exhaust mass flow rate is determined according to the standard parameter information, the back-pressure valve inlet information, and the back-pressure valve outlet information.

[0014] Optionally, determining the exhaust mass flow rate according to the standard parameter information, the back-pressure valve inlet information, and the back-pressure valve outlet information includes:

[0015] Determining a standard air pressure, a standard temperature, and a preset gas constant according to the standard parameter information;

[0016] Obtaining the effective flow area of ​​the back pressure valve of the system to be evaluated;

[0017] The exhaust mass flow rate is determined according to the standard air pressure, the standard temperature, the gas constant, the back pressure valve inlet information, the back pressure valve outlet information and the effective flow area.

[0018] Optionally, determining the exhaust mass flow rate according to the standard air pressure, the standard temperature, the gas constant, the back pressure valve inlet information, the back pressure valve outlet information, and the effective flow area includes:

[0019] Determine the back-pressure valve inlet pressure and the back-pressure valve inlet temperature according to the back-pressure valve inlet information;

[0020] Determining the back pressure valve outlet pressure according to the back pressure valve outlet information;

[0021] The exhaust mass flow rate is determined according to the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet pressure, the back-pressure valve inlet temperature, the back-pressure valve outlet pressure, and the effective flow area.

[0022] Optionally, determining the exhaust mass flow rate according to the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet pressure, the back-pressure valve inlet temperature, the back-pressure valve outlet pressure, and the effective flow area includes:

[0023] determining a density correction factor relative to a standard condition based on the standard air pressure, the standard temperature, the back-pressure valve inlet pressure, and the back-pressure valve inlet temperature;

[0024] determining a sonic flow rate under standard conditions based on the effective flow area, the standard air pressure, the gas constant, and the standard temperature;

[0025] Determining a sonic coefficient of the back-pressure valve according to the back-pressure valve outlet pressure and the back-pressure valve inlet pressure;

[0026] The exhaust mass flow rate is determined according to the density correction coefficient, the sonic flow rate, and the sonic coefficient.

[0027] Optionally, determining the consumed oxygen mass flow rate according to the stack information of the system to be evaluated includes:

[0028] Determine the Faraday constant and the molar mass of oxygen;

[0029] The consumed oxygen mass flow rate is determined according to the stack information of the system to be evaluated, the Faraday constant, and the molar mass of oxygen.

[0030] Optionally, determining the consumed oxygen mass flow rate according to the battery stack information of the system to be evaluated, the Faraday constant, and the oxygen molar mass includes:

[0031] Determining the number of single cells and the current output current of the battery stack of the system to be evaluated according to the battery stack information of the system to be evaluated;

[0032] The consumed oxygen mass flow rate is determined according to the number of single-chip cells, the current output current, the Faraday constant, and the molar mass of oxygen.

[0033] In addition, to achieve the above-mentioned purpose, the present invention further proposes a fuel cell air flow calculation device, the fuel cell air flow calculation device comprising:

[0034] An information acquisition module is used to obtain back pressure valve information and stack information of the system to be evaluated;

[0035] An exhaust calculation module, configured to determine the exhaust mass flow rate based on the back pressure valve information of the system to be evaluated;

[0036] An oxygen calculation module, configured to determine the mass flow rate of consumed oxygen based on the stack information of the system to be evaluated;

[0037] A flow calculation module is used to determine the intake air mass flow rate according to the exhaust gas flow rate and the oxygen mass flow rate.

[0038] In addition, to achieve the above-mentioned purpose, the present invention also proposes a fuel cell air flow calculation device, which includes: a memory, a processor, and a fuel cell air flow calculation program stored in the memory and executable on the processor, wherein the fuel cell air flow calculation program is configured to implement the steps of the fuel cell air flow calculation method described above.

[0039] In addition, to achieve the above objectives, the present invention also proposes a storage medium, which stores a fuel cell air flow calculation program. When the fuel cell air flow calculation program is executed by a processor, the steps of the fuel cell air flow calculation method described above are implemented.

[0040] The present invention obtains backpressure valve information and fuel cell stack information of the system to be evaluated; determines the exhaust mass flow rate based on the backpressure valve information of the system to be evaluated; determines the consumed oxygen mass flow rate based on the fuel cell stack information of the system to be evaluated; and determines the intake mass flow rate based on the exhaust mass flow rate and the oxygen mass flow rate. In this way, the exhaust mass flow rate and the consumed oxygen mass flow rate are directly calculated based on the backpressure valve information and fuel cell stack information of the system to be evaluated, thereby calculating the intake mass flow rate. This achieves the ability to obtain the intake mass flow rate without the need for an air mass flow meter, reducing the cost of calculating the intake mass flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural diagram of a fuel cell air flow calculation device in a hardware operating environment involved in an embodiment of the present invention;

[0042] Figure 2 This is a flow chart of a first embodiment of a method for calculating fuel cell air flow rate according to the present invention;

[0043] Figure 3 This is a flow chart of a second embodiment of a method for calculating fuel cell air flow rate according to the present invention;

[0044] Figure 4 Schematic diagram of the Saint-Venant curve in an embodiment of the method for calculating the air flow rate of a fuel cell according to the present invention;

[0045] Figure 5 This is a structural block diagram of the first embodiment of the fuel cell air flow calculation device of the present invention.

[0046] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of a fuel cell air flow calculation device in the hardware operating environment involved in an embodiment of the present invention.

[0049] like Figure 1As shown, the fuel cell air flow calculation device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may optionally include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) memory, or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0050] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the fuel cell air flow calculation device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0051] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a fuel cell air flow calculation program.

[0052] exist Figure 1 In the fuel cell air flow calculation device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the fuel cell air flow calculation device of the present invention can be set in the fuel cell air flow calculation device, and the fuel cell air flow calculation device calls the fuel cell air flow calculation program stored in the memory 1005 through the processor 1001 and executes the fuel cell air flow calculation method provided by the embodiment of the present invention.

[0053] The embodiment of the present invention provides a method for calculating the air flow of a fuel cell, referring to Figure 2 , Figure 2 This is a flow chart of a first embodiment of a method for calculating the air flow rate of a fuel cell according to the present invention.

[0054] In this embodiment, the fuel cell air flow calculation method includes the following steps:

[0055] Step S10: Obtain back pressure valve information and fuel cell stack information of the system to be evaluated.

[0056] It should be noted that the execution entity of this embodiment is a controller, primarily a controller for controlling the fuel cell air flow calculation method on the system under evaluation. It can also be a smart terminal that calculates the intake air mass flow rate based on the ambient air information of the system under evaluation. This smart terminal can be any device capable of performing this function, including but not limited to smartphones, desktop computers, tablet computers, etc. This embodiment does not impose any limitations on this.

[0057] It should be understood that currently, fuel cell intake mass flow is measured using an air mass flow meter, which requires the installation of an additional air mass flow meter and is relatively costly. However, the solution of this embodiment directly calculates the exhaust mass flow and the consumed oxygen mass flow based on the ambient air information and backpressure valve information of the system to be evaluated, thereby calculating the intake mass flow. This eliminates the need for an air mass flow meter and reduces the cost of calculating the intake mass flow.

[0058] In a specific implementation, the system to be evaluated can be a battery system of any model and type mainly including a hydrogen fuel cell, or can be any combination of battery systems, which is not limited in this embodiment.

[0059] It should be noted that the back pressure valve information refers to the relevant information of the air back pressure valve set in the system to be evaluated. The back pressure valve refers to an exhaust back pressure valve arranged in the exhaust pipeline of the fuel cell to control the system air pressure.

[0060] It should be understood that the battery stack information of the system to be evaluated refers to relevant information of a battery stack composed of a plurality of single cells stacked in series in the system to be evaluated.

[0061] Step S20: determining the exhaust mass flow rate according to the back pressure valve information of the system to be evaluated.

[0062] In a specific implementation, determining the exhaust mass flow rate of the system to be evaluated based on the backpressure valve information of the system to be evaluated refers to calculating the exhaust mass flow rate of the system to be evaluated based on standard parameter information in the standard air information and backpressure valve inlet information and backpressure valve outlet information in the backpressure valve information. The standard air information includes, but is not limited to, standard parameter information of the air in the environment of the system to be evaluated under standard conditions.

[0063] Step S30: Determine the consumed oxygen mass flow rate according to the fuel cell stack information of the system to be evaluated.

[0064] It should be understood that determining the consumed oxygen mass flow rate based on the ambient air information and the fuel cell stack information of the system to be evaluated means: first obtaining the Faraday constant and the molar mass of oxygen in the ambient air information, and then calculating the consumed oxygen mass flow rate in combination with the fuel cell stack information. The consumed oxygen mass flow rate refers to the oxygen flow rate that has been consumed by the system to be evaluated.

[0065] Furthermore, in order to accurately calculate the consumed oxygen mass flow rate, step S30 includes: determining the Faraday constant and the molar mass of oxygen; and determining the consumed oxygen mass flow rate according to the stack information of the system to be evaluated, the Faraday constant and the molar mass of oxygen.

[0066] In a specific implementation, the Faraday constant is: F=96485 C / mol, which is a preset and stored constant value and can be extracted from ambient air information.

[0067] It should be noted that the molar mass of oxygen is also a preset constant value. Specifically, the value of the molar mass of oxygen is:

[0068]

[0069] It should be understood that determining the consumed oxygen mass flow rate based on the battery stack information of the system to be evaluated, the Faraday constant and the molar mass of oxygen means: forming a calculation formula based on the number of single-cell battery cells and the current output current in the information according to the combination of the Faraday constant and the molar mass of oxygen, and then calculating the consumed oxygen mass flow rate based on the calculation formula.

[0070] In this way, the consumed oxygen mass flow rate is calculated based on the Faraday constant and oxygen molar mass pre-stored in the ambient air information combined with the stack information.

[0071] Furthermore, in order to calculate the mass flow rate of consumed oxygen, the step of determining the mass flow rate of consumed oxygen based on the battery stack information of the system to be evaluated, the Faraday constant and the molar mass of oxygen includes: determining the number of single-chip cells and the current output current of the battery stack of the system to be evaluated based on the battery stack information of the system to be evaluated; and determining the mass flow rate of consumed oxygen based on the number of single-chip cells, the current output current, the Faraday constant and the molar mass of oxygen.

[0072] In a specific implementation, the number of single-cell batteries refers to the specific number of single-cell batteries stacked in series in a battery stack.

[0073] It should be noted that the current output current refers to the current output by the entire battery stack when the battery is output.

[0074] It should be understood that the calculation formula for the mass flow rate of consumed oxygen is:

[0075]

[0076] in, is the mass flow rate of consumed oxygen. N is the number of cells in the stack, I is the current output current of the stack, F is the Faraday constant, and M is the current output current of the stack. O2 is the molar mass of oxygen.

[0077] In this way, the consumed oxygen mass flow rate is accurately calculated, and the intake air mass flow rate can be inferred based on the oxygen mass flow rate.

[0078] Step S40: determining the intake air mass flow rate according to the exhaust gas flow rate and the oxygen mass flow rate.

[0079] In a specific implementation, the intake mass flow is the sum of the exhaust mass flow and the consumed oxygen mass flow. Specifically, the intake mass flow is calculated as follows:

[0080]

[0081] in, is the intake air mass flow rate, is the exhaust mass flow rate, is the mass flow rate of consumed oxygen.

[0082] This embodiment obtains backpressure valve information and fuel cell stack information of the system to be evaluated; determines the exhaust mass flow rate based on the backpressure valve information; determines the consumed oxygen mass flow rate based on the fuel cell stack information of the system to be evaluated; and determines the intake mass flow rate based on the exhaust mass flow rate and the oxygen mass flow rate. In this way, the exhaust mass flow rate and the consumed oxygen mass flow rate are directly calculated based on the backpressure valve information and fuel cell stack information of the system to be evaluated, thereby calculating the intake mass flow rate. This allows the intake mass flow rate to be obtained without the need for an air mass flow meter, reducing the cost of calculating the intake mass flow rate.

[0083] refer to Figure 3 , Figure 3 This is a flow chart of a second embodiment of a method for calculating the air flow rate of a fuel cell according to the present invention.

[0084] Based on the first embodiment described above, the fuel cell air flow calculation method of this embodiment includes, in step S20:

[0085] Step S201: Determine standard parameter information under standard conditions.

[0086] It should be noted that the standard parameter information under standard conditions includes preset values ​​of various parameters of air under standard conditions.

[0087] Step S202: Determine back-pressure valve inlet information and back-pressure valve outlet information according to the back-pressure valve information of the system to be evaluated.

[0088] It should be understood that the back pressure valve inlet information includes information such as the pressure and temperature at the inlet of the back pressure valve, and the back pressure valve inlet information is measured by a sensor.

[0089] In a specific implementation, the back pressure valve outlet information is the pressure at the back pressure valve outlet, which can be estimated using atmospheric pressure.

[0090] Step S203: determining the exhaust mass flow rate according to the standard parameter information, the back-pressure valve inlet information, and the back-pressure valve outlet information.

[0091] It should be noted that determining the exhaust mass flow rate based on the standard parameter information, the back pressure valve inlet information and the back pressure valve outlet information means: extracting and calculating the preset parameter values ​​required based on the standard parameter information, and then calculating the exhaust mass flow rate in combination with the pressure and temperature information in the back pressure valve inlet information and the back pressure valve outlet information.

[0092] Furthermore, in order to more accurately calculate the exhaust mass flow rate, step S203 includes: determining the standard air pressure, standard temperature and preset gas constant based on the standard parameter information; obtaining the effective flow area of ​​the back pressure valve of the system to be evaluated; and determining the exhaust mass flow rate based on the standard air pressure, the standard temperature, the gas constant, the back pressure valve inlet information, the back pressure valve outlet information and the effective flow area.

[0093] It should be understood that standard air pressure and standard temperature refer to the pressure and temperature of air under standard conditions. The preset gas constant refers to a fixed value preset by the user and is a physical constant that relates various thermodynamic functions in the equation of state.

[0094] In a specific implementation, the effective flow area refers to the valve cross-sectional area of ​​the back pressure valve of the system to be evaluated, which is obtained through measurement and is used for the flow of air.

[0095] It should be noted that determining the exhaust mass flow rate based on the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet information, the back-pressure valve outlet information, and the effective flow area means: calculating the back-pressure valve inlet pressure, the back-pressure valve inlet temperature, and the back-pressure valve outlet pressure based on the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet pressure, the back-pressure valve inlet temperature, the back-pressure valve outlet pressure, and the effective flow area, respectively, and then determining the exhaust mass flow rate.

[0096] In this way, the effective flow area of ​​the back pressure valve is introduced and combined with the gas constant to calculate the exhaust mass flow rate, making the calculation of the exhaust mass flow rate more accurate.

[0097] Furthermore, in order to calculate the exhaust mass flow rate, the step of determining the exhaust mass flow rate based on the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet information, the back-pressure valve outlet information and the effective flow area includes: determining the back-pressure valve inlet pressure and the back-pressure valve inlet temperature based on the back-pressure valve inlet information; determining the back-pressure valve outlet pressure based on the back-pressure valve outlet information; determining the exhaust mass flow rate based on the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet pressure, the back-pressure valve inlet temperature, the back-pressure valve outlet pressure and the effective flow area.

[0098] It should be understood that the back pressure valve inlet pressure and the back pressure valve inlet temperature are both measured by sensors, and the back pressure valve outlet pressure is estimated from the atmospheric pressure.

[0099] In a specific implementation, determining the exhaust mass flow rate based on the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet pressure, the back-pressure valve inlet temperature, the back-pressure valve outlet pressure and the effective flow area means: first obtaining the density correction coefficient, the sonic flow rate and the sonic coefficient based on the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet pressure, the back-pressure valve inlet temperature, the back-pressure valve outlet pressure and the effective flow area, and finally obtaining the exhaust mass flow rate based on the density correction coefficient, the sonic flow rate and the sonic coefficient.

[0100] In this way, all parameters required for calculation and their values ​​are obtained, making the calculation of exhaust mass flow more accurate.

[0101] Furthermore, in order to calculate the density correction coefficient, sonic flow rate and sonic coefficient, the step of determining the exhaust mass flow rate according to the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet pressure, the back-pressure valve inlet temperature, the back-pressure valve outlet pressure and the effective flow area includes: determining the density correction coefficient relative to the standard conditions according to the standard air pressure, the standard temperature, the back-pressure valve inlet pressure and the back-pressure valve inlet temperature; determining the sonic flow rate under standard conditions according to the effective flow area, the standard air pressure, the gas constant and the standard temperature; determining the sonic coefficient of the back-pressure valve according to the back-pressure valve outlet pressure and the back-pressure valve inlet pressure; and determining the exhaust mass flow rate according to the density correction coefficient, the sonic flow rate and the sonic coefficient.

[0102] It should be noted that P0 and T0 are the air pressure and temperature under standard conditions, P0 = 101.3 kPa, T0 = 293.15 K

[0103] P in and T in are the back pressure valve inlet pressure and temperature, P out is the outlet pressure of the back pressure valve, which can be estimated using atmospheric pressure, R is the gas constant, A eff is the effective flow area of ​​the back pressure valve.

[0104] In order to take into account the small amount of nitrogen in the air that permeates from the anode side of the fuel cell stack to the cathode side, as well as the small amount of water vapor mixed in when the air passes through the fuel cell stack, the exhaust flow rate needs to be corrected in actual application, which is the density correction factor. Therefore, the calculation formula of the density correction factor is:

[0105]

[0106] The calculation formula for sonic flow is:

[0107]

[0108] Among them, the sonic flow rate is defined as the sonic flow rate under standard conditions, which is related to the opening of the back pressure valve, and the corresponding relationship needs to be obtained through calibration tests.

[0109] The calculation formula of the speed of sound coefficient is:

[0110]

[0111] The sonic coefficient is related to the inlet and outlet pressure ratio of the back pressure valve. It is a fixed curve called the Saint-Venant curve. Specifically, the schematic diagram of the Saint-Venant curve is as follows: Figure 4 shown.

[0112] It should be noted that the final calculation formula for exhaust mass flow is:

[0113]

[0114] In this way, the exhaust mass flow rate is accurately calculated, and ultimately the intake mass flow rate can be more accurately reversely measured.

[0115] This embodiment determines standard parameter information under standard conditions based on the ambient air information; determines backpressure valve inlet and outlet information based on the backpressure valve information of the system to be evaluated; and determines the exhaust mass flow rate based on the standard parameter information, the backpressure valve inlet information, and the backpressure valve outlet information. This method calculates the exhaust mass flow rate based on the standard parameter information combined with the relevant parameters of the backpressure valve of the system to be evaluated, eliminating the need for additional flow measurement equipment and achieving accurate exhaust mass flow rate calculation at a lower cost.

[0116] In addition, an embodiment of the present invention further provides a storage medium storing a fuel cell air flow calculation program. When the fuel cell air flow calculation program is executed by a processor, the steps of the fuel cell air flow calculation method described above are implemented.

[0117] Since the storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0118] Reference Figure 5 , Figure 5 This is a structural block diagram of the first embodiment of the fuel cell air flow calculation device of the present invention.

[0119] like Figure 5 As shown, the fuel cell air flow calculation device proposed in the embodiment of the present invention includes:

[0120] The information acquisition module 10 is used to obtain the back pressure valve information and the stack information of the system to be evaluated.

[0121] The exhaust calculation module 20 is used to determine the exhaust mass flow rate according to the back pressure valve information of the system to be evaluated.

[0122] The oxygen calculation module 30 is used to determine the consumed oxygen mass flow rate based on the fuel cell stack information of the system to be evaluated.

[0123] The flow calculation module 40 is configured to determine the intake air mass flow rate according to the exhaust gas mass flow rate and the oxygen mass flow rate.

[0124] This embodiment obtains backpressure valve information and fuel cell stack information of the system to be evaluated; determines the exhaust mass flow rate based on the backpressure valve information; determines the consumed oxygen mass flow rate based on the fuel cell stack information of the system to be evaluated; and determines the intake mass flow rate based on the exhaust mass flow rate and the oxygen mass flow rate. In this way, the exhaust mass flow rate and the consumed oxygen mass flow rate are directly calculated based on the backpressure valve information and fuel cell stack information of the system to be evaluated, thereby calculating the intake mass flow rate. This allows the intake mass flow rate to be obtained without the need for an air mass flow meter, reducing the cost of calculating the intake mass flow rate.

[0125] In one embodiment, the exhaust calculation module 20 is also used to determine standard parameter information under standard conditions; determine backpressure valve inlet information and backpressure valve outlet information based on the backpressure valve information of the system to be evaluated; and determine the exhaust mass flow rate based on the standard parameter information, the backpressure valve inlet information, and the backpressure valve outlet information.

[0126] In one embodiment, the exhaust calculation module 20 is further used to determine the standard air pressure, standard temperature and preset gas constant based on the standard parameter information; obtain the effective flow area of ​​the back pressure valve of the system to be evaluated; and determine the exhaust mass flow rate based on the standard air pressure, the standard temperature, the gas constant, the back pressure valve inlet information, the back pressure valve outlet information and the effective flow area.

[0127] In one embodiment, the exhaust calculation module 20 is further used to determine the back-pressure valve inlet pressure and the back-pressure valve inlet temperature based on the back-pressure valve inlet information; determine the back-pressure valve outlet pressure based on the back-pressure valve outlet information; and determine the exhaust mass flow rate based on the standard air pressure, the standard temperature, the gas constant, the back-pressure valve inlet pressure, the back-pressure valve inlet temperature, the back-pressure valve outlet pressure, and the effective flow area.

[0128] In one embodiment, the exhaust calculation module 20 is further used to determine a density correction coefficient relative to standard conditions based on the standard air pressure, the standard temperature, the back-pressure valve inlet pressure and the back-pressure valve inlet temperature; determine the sonic flow rate under standard conditions based on the effective flow area, the standard air pressure, the gas constant and the standard temperature; determine the sonic coefficient of the back-pressure valve based on the back-pressure valve outlet pressure and the back-pressure valve inlet pressure; and determine the exhaust mass flow rate based on the density correction coefficient, the sonic flow rate and the sonic coefficient.

[0129] In one embodiment, the oxygen calculation module 30 is further configured to determine the Faraday constant and the molar mass of oxygen; and to determine the consumed oxygen mass flow rate based on the stack information of the system to be evaluated, the Faraday constant and the molar mass of oxygen.

[0130] In one embodiment, the oxygen calculation module 30 is further used to determine the number of single-cell batteries and the current output current of the battery stack of the system to be evaluated based on the battery stack information of the system to be evaluated; and determine the consumed oxygen mass flow rate based on the number of single-cell batteries, the current output current, the Faraday constant and the molar mass of oxygen.

[0131] It should be understood that the above is only an example and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any limitation on this.

[0132] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of it according to actual needs to achieve the purpose of the embodiment scheme, and no limitation is made here.

[0133] In addition, for technical details not fully described in this embodiment, reference can be made to the fuel cell air flow calculation method provided in any embodiment of the present invention, and will not be repeated here.

[0134] In addition, it should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0135] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0136] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, or of course by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0137] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for calculating fuel cell air flow, characterized in that: The fuel cell air flow calculation method includes: Obtain the back pressure valve information and stack information of the system to be evaluated; Determine standard parameter information under standard conditions; Determine back pressure valve inlet information and back pressure valve outlet information according to the back pressure valve information of the system to be evaluated; Determining a standard air pressure, a standard temperature, and a preset gas constant according to the standard parameter information; Obtaining the effective flow area of ​​the back pressure valve of the system to be evaluated; Determine the back-pressure valve inlet pressure and the back-pressure valve inlet temperature according to the back-pressure valve inlet information; Determining the back pressure valve outlet pressure according to the back pressure valve outlet information; determining a density correction factor relative to a standard condition based on the standard air pressure, the standard temperature, the back-pressure valve inlet pressure, and the back-pressure valve inlet temperature; determining a sonic flow rate under standard conditions based on the effective flow area, the standard air pressure, a preset gas constant, and the standard temperature; Determining a sonic coefficient of the back-pressure valve according to the back-pressure valve outlet pressure and the back-pressure valve inlet pressure; determining the exhaust mass flow rate according to the density correction coefficient, the sonic flow rate, and the sonic coefficient; Determining the consumed oxygen mass flow rate based on the stack information of the system to be evaluated; An intake air mass flow rate is determined based on the exhaust gas mass flow rate and the consumed oxygen mass flow rate.

2. The method according to claim 1, wherein The step of determining the consumed oxygen mass flow rate according to the stack information of the system to be evaluated includes: determine the Faraday constant and the molar mass of oxygen; The consumed oxygen mass flow rate is determined according to the stack information of the system to be evaluated, the Faraday constant, and the molar mass of oxygen.

3. The method according to claim 2, wherein The determining the consumed oxygen mass flow rate according to the stack information of the system to be evaluated, the Faraday constant, and the oxygen molar mass includes: Determining the number of single cells and the current output current of the battery stack of the system to be evaluated according to the battery stack information of the system to be evaluated; The consumed oxygen mass flow rate is determined according to the number of single-chip cells, the current output current, the Faraday constant, and the molar mass of oxygen.

4. A fuel cell air flow calculation device, characterized in that: The fuel cell air flow calculation device includes: An information acquisition module is used to obtain back pressure valve information and stack information of the system to be evaluated; an exhaust calculation module, configured to determine standard parameter information under standard conditions; determine backpressure valve inlet information and backpressure valve outlet information according to the backpressure valve information of the system to be evaluated; determine standard air pressure, standard temperature and a preset gas constant according to the standard parameter information; obtain an effective flow area of ​​the backpressure valve of the system to be evaluated; determine the backpressure valve inlet pressure and the backpressure valve inlet temperature according to the backpressure valve inlet information; determine the backpressure valve outlet pressure according to the backpressure valve outlet information; determine a density correction coefficient relative to standard conditions according to the standard air pressure, the standard temperature, the backpressure valve inlet pressure and the backpressure valve inlet temperature; determine a sonic flow rate under standard conditions according to the effective flow area, the standard air pressure, the preset gas constant and the standard temperature; determine a sonic coefficient of the backpressure valve according to the backpressure valve outlet pressure and the backpressure valve inlet pressure; and determine an exhaust mass flow rate according to the density correction coefficient, the sonic flow rate and the sonic coefficient; An oxygen calculation module, configured to determine the mass flow rate of consumed oxygen based on the stack information of the system to be evaluated; The flow calculation module is configured to determine the intake mass flow rate according to the exhaust mass flow rate and the consumed oxygen mass flow rate.

5. A fuel cell air flow calculation device, characterized in that: The device includes: a memory, a processor, and a fuel cell air flow calculation program stored in the memory and executable on the processor, wherein the fuel cell air flow calculation program is configured to implement the fuel cell air flow calculation method according to any one of claims 1 to 3.

6. A storage medium, characterized in that The storage medium stores a fuel cell air flow calculation program, which, when executed by a processor, implements the fuel cell air flow calculation method according to any one of claims 1 to 3.

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